This is a library of perfboard and single-sided PCB effect layouts for guitar and bass. I'm not an electrical engineer by any stretch of the imagination, just a DIY'er who likes drawing layouts. It is meant for the hobbyist (so commercial use of any of these layout is not allowed without permission) and as a way to give back to the online DIY community.

Monday, July 25, 2016

One-Knob Noise Gate

Found this one over on the Tagboard forum and thought it would be a good addition here. It's a simple noise gate with minimal parts count that can easily fit in a 1590a. I've laid it out for a board mounted pot. The schematic calls for a 1M pot, but people have built this using one as low as 25k, so experiment there. The original schematic was a little hard to read so I redrew it.


32 comments:

  1. I would think so. That's what I would sub.

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  2. yay!!! let's make one, coz our mxr noise gate didn't work
    awesome as usual brother.
    still finding way to donate though...

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  3. ah, one question,
    will rotated 2n7000 for bs170 do?

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  4. can i use j201 or 2n5457 instead of the bs170????

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    1. No, that needs to be a MOSFET, not a JFET. BS170 or 2N7000 are your best bet.

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  5. You can use BSS296 or 2SK422 , pinning attention? Another detail and that the gain of the 2N7000 and a little less than the BS170 , will have to reverse also the 2N7000 .

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  6. Spectacular! Just in these days I was drawing exactly the same diagram, but you did first, great!
    How you can mod it to control the decay
    or attack of the gate?
    Greetings from Argentina!

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    1. Diego! Lo arme y asi como figura aca funciona muy bien. Le puse un LPB-1 antes y ahi si que quedo excelente, tiene un muy buen desempeño. Estaba buscando la misma mod que vos, pero nada (convengamos que no soy un Einsten en esto y que lo arme hace pocos dias :P). Si descubriste algo y podes compartirlo, seria genial! Abrazo papa!

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    2. This comment has been removed by the author.

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    3. Hello, I found this topic in the diystomboxes forum.
      Kipper4 solution is good.
      I hope it works for you
      http://www.diystompboxes.com/smfforum/index.php?topic=114229.0

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    4. Diego, como estas? Vos sabes que yo arme este mismo... pero puede ser q funcione bien cuando viene con ganancia? O sea le conecto solo la guitarra con un simple bobina para q haga zumbido y no lo corta.... lo probaste con pote de 1 mega o 25 k? Saludos!

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  7. I used 2n7000 and 2n3904 for Bjt's .. thanks PCB layoutsb:D greetings From Philippines

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  8. All transistors should be rotated in 180 deg.

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    1. Why? I have all the parts installed as shown above and signal passes but I don't think it is gating the sound. Nothing changes when I turn the pot all the way clockwise. All sound drops drastically when the pot is all the way counterclockwise.

      Why do you say rotate the transistors?

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  9. my build is working correctly. but the pot, A1M, I don't get any change when I turn it up and down. It also reduces my overall volume a little bit.
    any idea?

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    1. See the post about the pot value and it might just benefit from a buffer in front of it.

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    2. I am the same as several people speaking, nothing happens. I can understand that silence failed when switching on, but nothing happens, same as when off. If you are successfully verified, please advise me.

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  10. While i'm waiting for a pair of bs170 i've tried with an irf520 but it doesn't nothing with the sound, it's still the same. That mosfet by the way, has almost the same values than bs170.... What should be the problem????

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  11. Built but it is effecting the tone quite a bit. When using a clean sound, its sounding slightly distorted. I'm using 2 BC550's and a BS170 as my trannies. Any ideas or does that explain why most noise gate circuits are much much bigger?

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  12. Verified! It works really great with a buffer or a booster in front of it. Nice work guys!

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  13. Hello! thank you all for your contributions. I have learned a lot by building several pedals here.
    Now a question. What is the function of diodes 5718 ?, since in the schematic does not appear. Greetings from Argentina.

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    1. That's just there for polarity protection. If you accidentally plug in a power supply that is positive ground, that diode with keep the circuit safe.

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  14. Thank you very much for your reply. So, can this diode be replaced by a diode 1n4001 or similar? Thank you very much again.

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    1. Yes, a 4001 will work, but will drop a little more voltage than the 5817. But it shouldn't be a big deal.

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  15. Thank you very much everyone for the responses.

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  16. HI! Thanks for amazing site with a lot of great schematics. I'm new in diy and this is my second effect, and I have a problem with it.
    I did it on pcb version with the same components such on layout, but when I turn up pot, it starts gating immediately and stop it in a second (or few), this happens when turn pot up, when it turn down - nothing happened. Please help me to find a problem. Sorry for bad English.

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  17. UPD: When I'm playing, it turns on gating every 10-15 seconds on few seconds again.
    Can problem be in some of capacitors? Or something else?

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  18. Hi!

    This thing works like a charm in my amps FX loop.
    Kinda on/off, will box it without the B1M.
    Does what it's supposed to and good.

    Thanks!

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  19. Works fine, but when it opens to let signal pass a "click" is heard. Use bs549 and bs170 and potentiometer of 25k. Is there any way to fix that "click", Thank you

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